Brake for conveyers



F. HUBBARD.

BRAKE FOR CONVEYERS.

APPLICATION FILED JAN. 7. I919.

Patented Jan. 6

F. HUBBARD.

BRAKE FOR CONVEYERS.

APPLICATION FILED JAN-7.1919.

1,327,559. Patented Jan. 6, 1920.

2 SHEETS-SHEET 2- FRED HUBBARD, OF HUMBOLDT, ARIZONA.

BRAKE FOR CONVEYERS.

Specification of Letters Patent.

Patented Jan. 6, 1920.

Application filed January 7, 1919. Serial No. 269,980.

To all whom it may concern:

3e it known that l, FRED HUBBARD, a citizen of the United States of America,

residing at Humboldt, in the county of ward and the present invention is a unique,

eflicient and inexpensive means readily attachable to the conveyer frame and engageable with the belt during retrograde movement of the latter, the connection of this engagement being such that the belt is effectively stopped. On the forward move ment of the belt however, the device idles and in no way interferes with the eflicient operation of the belt.

To the exact construction in which it is shown and described, the invention is not to be. restricted. Continued use in practice may make manifest certain desirable changes or alterations and the right is claimed to make any which do not deviate in scope from the subjoined claim.

The same numerals of reference designate the same parts throughout the several figures of the drawings, wherein:

Figure 1 is a view in side elevation of the forward or delivery end of a conveyer belt, the attachment or brake being shown in use therewith butin idling position.

Fig. 2 is a view similar to Fig. 1 but with the device in braking position to prevent retrograde movement of the belt.

Fig. 3 is an enlarged front elevational view of the brake per se.

Fig. 1 is a side elevational view of the structure of Fig. 3.

The invention is shown in use as a medium for stopping retrograde movement of the belt 1 the upper or delivery end of which is trained over the roller 2, back over the idle roller 3 and then forward over the forward idler 1, the latter as is usual beino' directly below the roller 2. The belt tiereafter passes to the receiving end of the conveyer, being directed to the latter over the idler 5. The belt 1 at the time of acting as a carrying medium is supported at uniformly spaced intervals by the rollers 65. All of the structure just described is characteristicof the outer form of belt conveyor and the structure as a whole is supported on the frame work 7, the diagonally disposed angle iron 8 which form bracing mediums for certain parts of the frame having attached between them the device for performing the braking function when there is a tendency to retrograde movement on the part of the belt 1.

The angle irons 8, it will be observed are disposed on that part of the frame between the rollers 3 and 4E and there is attached between these the round bar 9, the latter having its ends passed through suitable holes formed in the angles and having its ends threaded for the attachment of nuts 10 which abut the two angles on opposite sides and in this way secure the bar 9 between them.

Swinging upon the bar 9 there are two arms 11 which are united by means of a transverse plate 12, riveted or otherwise suitably secured to the two arms. Each of these arms is formed at its lower end with a bearing hub 13 in which there is journaled one end of a shaft 14, the latter carrying a roller 15 which is fixedly secured to the shaft and abuts the two bearing hubs at its ends. The roller 15 is slightly longer than the belt 1 is wide and it lies upon the belt adjacent to the roller 3, idling as is shown in Fig. 1 when the belt is moving forwardly and jamming between the roller 3 and the belt if the latter starts to move backward. The two arms 11 and the plate 12 constitute a unitary structure for carrying the roller 15 and in order that the latter may be definitely positoned for engagement with the belt spaced washers 16 are mounted on the bar 1 between the arms 11 and the angle iron 8. These washers successfully preclude any lateral movement of the frame comprising the arms and thus the roller 15 is kept in' its proper position with reference to the belt.

The arms 15 are both provided with longitudinal slots 17 and the bar 9 passes through these slots, abutting the upper ends of the slots when the roller is in braking position and abutting the lower ends of the slots when it is in idling position.

To provide for lubricating the journals nus! of the shaft 14, grease cups 18 are attached to the bearing hubs 13 for the obvious purpose of supplying the journals with lubricant.

The bar 9, it willbe observed constitutes the axis of movement and is, as is apparent, offset from the axis of rotation of the roller 3. When the belt is moved forwardly, it will be passed from the bottom of the pulley 3 toward the top of the pulley 4 and its tendency therefore is to carry the roller 15 and its attendant frame in the same direction, when the frame is caused to rise so that the bar 9 stands against or adjacent to the bottom ends of the slots 17. The rollers are thus run free on the belt but in case the driving medium of the belt is stopped and the load carried thereon tends to carry thebelt backwardly, the roller 15 and its frame will be carried in the direction of the roller 3, the slot 17 permitting the frame to descend as it is carried in the direction of the roller 3. When the bar 9 abuts the up l per ends of the slots 17 the roller 15 is thrown against the surface of the roller 3 with the result that there is a tendency to turn it and the roller 3 in opposite directions the belt the while tending to move in is claimed as new and useful is The combination of a frame, rollers rotatably mounted in the frame, a conveyer belt trained over said rollers, a secondary frame carried by the first said frame, the said secondary frame comprising arms in which there forms longitudinal slots, a bar mounted in the first said frame and passing through the slots, and a roller j ournaled in the secondary frame and bearing upon the belt, whereby the said frame may swing toward or away from one of the first said rollers so that the last said roller may idle upon the belt or jam between it and one of the first said rollers for the useful purpose'herein specified.

In testimony whereof I afiiX my signature.

FRED HUBBARD. 

